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A general revision of the Palaemonidae (Crustacea decapoda natantia) of the Americas. 1. The subfamilies Euryrhynchinae and Pontoniinae

A general revision of the Palaemonidae (Crustacea decapoda natantia) of the Americas. 1. The subfamilies Euryrhynchinae and Pontoniinae, Periclimenes (Periclimenes) iridescens, p. 43

NO. 11 HOLTHUIS: PALAEMONIDAE OF AMERICAS, PART I 43
somewhat beyond the scaphocerite. The dactylus is distinctly bifid.
The propodus is 4 times as long as the dactylus and twice as long as
the carpus. The merus is slightly shorter than the propodus and somewhat less than twice as long as the ischium. The fifth leg is similar to
the third, only the carpus and propodus are somewhat longer.
The pleopods and uropods in my only specimen, which is a female,
are normal in shape.
Size: The type and only specimen is 18 mm long.
Material examined: The only known specimen thus far, is preserved in the U.S. National Museum (Cat. No. 85366). It was collected
from the Gulf stream off Key West, Fla., 24° 21'55" N, 81° 58'25"
W (98 fms, Feb. 14, 1902, Fish Hawk, Sta. 7279).
Periclimenes (Periclimenes) iridescens Lebour
PL 12, figs, a-m; pi. 20, figs, i-j
Periclimenes iridescens Lebour, 1949, Proc. Zool. Soc. Lond., vol. 118,
p. 1112, figs. 4, 5.
Description: The rostrum is short, straight and rather high. It
reaches to the base or to the end of the second segment of the antennular
peduncle. The upper margin is somewhat convex and bears 5 to 7 teeth,
one or two of which are placed behind the orbit on the carapace. The
first tooth is farther removed from the second than the third is. The
teeth are regularly divided over the rostrum though there sometimes
is an unarmed portion before the tip. The lower margin bears 0 to 3
teeth, if teeth are present, then they are extremely small and inconspicuous. The carapace bears no postorbital ridge; the rostral midrib runs
close to the lower margin of the rostrum. Antennal and hepatic, but
no supraorbital spines are present. The lower orbital angle is forwardly
produced into a blunt lobe, which is somewhat constricted near the
base. The antennal spine stands somewhat below this angle. The hepatic
spine is of about the same strength as the antennal and is situated distinctly below it. The anterolateral angle of the carapace is broadly
rounded.
The abdomen has the pleurae of all the segments rounded. The
third segment is slightly produced in the posterior median part, but
does not form a hump. The sixth segment is about twice as long as the
fifth and slightly longer than the telson. The telson is provided with 2
pairs of minute dorsal spinules. The anterior pair is situated in the
middle of the telson, the second pair halfway between the first pair and
the posterior margin of the telson. The 3 posterior pairs of spines are of

NO. 11 HOLTHUIS: PALAEMONIDAE OF AMERICAS, PART I 43
somewhat beyond the scaphocerite. The dactylus is distinctly bifid.
The propodus is 4 times as long as the dactylus and twice as long as
the carpus. The merus is slightly shorter than the propodus and somewhat less than twice as long as the ischium. The fifth leg is similar to
the third, only the carpus and propodus are somewhat longer.
The pleopods and uropods in my only specimen, which is a female,
are normal in shape.
Size: The type and only specimen is 18 mm long.
Material examined: The only known specimen thus far, is preserved in the U.S. National Museum (Cat. No. 85366). It was collected
from the Gulf stream off Key West, Fla., 24° 21'55" N, 81° 58'25"
W (98 fms, Feb. 14, 1902, Fish Hawk, Sta. 7279).
Periclimenes (Periclimenes) iridescens Lebour
PL 12, figs, a-m; pi. 20, figs, i-j
Periclimenes iridescens Lebour, 1949, Proc. Zool. Soc. Lond., vol. 118,
p. 1112, figs. 4, 5.
Description: The rostrum is short, straight and rather high. It
reaches to the base or to the end of the second segment of the antennular
peduncle. The upper margin is somewhat convex and bears 5 to 7 teeth,
one or two of which are placed behind the orbit on the carapace. The
first tooth is farther removed from the second than the third is. The
teeth are regularly divided over the rostrum though there sometimes
is an unarmed portion before the tip. The lower margin bears 0 to 3
teeth, if teeth are present, then they are extremely small and inconspicuous. The carapace bears no postorbital ridge; the rostral midrib runs
close to the lower margin of the rostrum. Antennal and hepatic, but
no supraorbital spines are present. The lower orbital angle is forwardly
produced into a blunt lobe, which is somewhat constricted near the
base. The antennal spine stands somewhat below this angle. The hepatic
spine is of about the same strength as the antennal and is situated distinctly below it. The anterolateral angle of the carapace is broadly
rounded.
The abdomen has the pleurae of all the segments rounded. The
third segment is slightly produced in the posterior median part, but
does not form a hump. The sixth segment is about twice as long as the
fifth and slightly longer than the telson. The telson is provided with 2
pairs of minute dorsal spinules. The anterior pair is situated in the
middle of the telson, the second pair halfway between the first pair and
the posterior margin of the telson. The 3 posterior pairs of spines are of